<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>类的继承</title>
  </head>
  <body></body>
</html>
<script>
  class Animal {
    constructor(name) {
      this.name = name;
    }
  }
  class Dog extends Animal {
    constructor(name) {
      super(name); // 调用父类的构造函数
    }
  }
</script>
